Pg 314“The unwound sections of parental DNA strands are now available to serve as templates for the synthesis of a polynucleotide; they can only add nucleotides to the end of an already existing chain that is produced during DNA synthesis is actually a short stretch of RNA, not DNA”What does the second part of the paragraph mean?

They describe the primers known as Okazaki fragments. The DNA polymerase can only extend a Nucleic acid chain, it cannot start it from scratch. Those bits of RNA serves as the starting block that are then extended by the polymerase.

Patrick

Science has proof without any certainty. Creationists have certainty without
any proof. (Ashley Montague)

Pg 316Proofreading and repairing DNA “We cannot attribute the accuracy of DNA replication solely to the specificity of base pairing.”Just exactly what it means particular the word “attribute” used in this context?Also following that:“Although errors in the completed DNA molecule amount to only one in 10 billion nucleotides, initial pairing errors between incoming nucleotides and those in the template strand are 100,000 times more common- an error rate of one in 100,000 nucleotides.”What does this mean????

That means, that the base-pairing during DNA synthesis has mistake rate 1 in 100 000 nucleotides. But the final error rate is only 1 in 10 billions. Thus there must be some additional correcting mechanism

you don't speak English? I'm sorry, but these are quite stupid questions about solitary senteces.

As canalon already told you and you have maybe read, the DNA replication starts from primers, which are RNA. But the DNA cannot contain pieces of RNA, because it's unstable. Thus the primers must be replaced and they are replaced by DNA Pol I.

pg 233The two liberated daughter chromosomes begin moving toward opposite ends of the cell as their kinetochore shorten. Because these microtubules are attached at the centromere region, the chromosomes move centromere first (at about 1um/min).